main .mian_nav {
    display: flex;
    align-items: center;
    height: 70px;
}

main .mian_nav ul {
    display: flex;
    width: 100%;
    height: 30px;
}

main .mian_nav ul li {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    text-align: center;
    line-height: 30px;
}

main .mian_nav ul li p {
    width: 70%;
    height: 100%;
    color: blueviolet;
    cursor: pointer;
}

main .mian_nav ul li p a {
    display: block;
    width: 100%;
    height: 100%;
}

main .mian_nav ul li p:hover {
    background-color: blueviolet;
    border-radius: 30px;
    color: #fff;
}

main .mian_nav ul li p:hover a {
    color: #fff;
}

.Classification {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    margin: 40px 0px;
}